/*
day472 
2020.12.12 
*/
#include<iostream>
#include<vector>
using namespace std;

class Solution {
public:
    vector<int> swapNumbers(vector<int>& numbers) {
		numbers[0]^=numbers[1];
		numbers[1]^=numbers[0];
		numbers[0]^=numbers[1];
		
		return numbers;
    }
};

int main()
{
	return 0;
}
